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    PCB CAD Software

    Hi guys,

    About to start on a large project and I could use a couple suggestions.

    The prototype will be built as a series of daughterboards linked to a single motherboard containing essentially...
  2. That's funny, when I first read that paragraph in...

    That's funny, when I first read that paragraph in the reference article, I thought "I bet 'processor' clock really means 'F_BUS' clock." Thanks for confirming.

    I guess I find it a little odd that...
  3. FreqMeasure capabilities on T3.6 and T4

    Hello,

    I am potentially going to be measuring a square-wave signal (.5 to 5KHz) with a Teensy 3.6 and possibly later a Teensy 4.

    The low end of this range is a major control input for my...
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    Improving Character LCD Refresh Rate

    I'm using several of these types of character LCDs in various pieces of gadgetry:

    https://www.adafruit.com/product/198

    I like them because they are inexpensive, easy, and a useful size. The one...
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    Reviewing the 1050 datasheet, it says: Am...

    Reviewing the 1050 datasheet, it says:



    Am I correct in interpreting this to mean the 1050's ADC is technically 12-bit, but only 10/11 are useful like the 3.6 is technically 16-bit, but only...
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    Roger that, thanks for the quick response.

    Roger that, thanks for the quick response.
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    FreqMeasureMulti and pinMode

    Hello all,

    I am attempting to measure 3 pulse signals. I had this project going on a Due but moved it to a 3.2. My circuitry is configured for internal pullups, and just now, altering the source...
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    Custom full-authority ECU for use in the...

    Custom full-authority ECU for use in the motorsport sector. Modular avionics-level sensor package, datalogging, engine protection, etc.
  9. Any update? I'd love to get some of these.

    Any update? I'd love to get some of these.
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    At this point I don't have the experience to lend...

    At this point I don't have the experience to lend any useful suggestions on specific pins to include or exclude.

    Unless several variants optimized for specific roles could be developed (T4-audio,...
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    Replies in red.

    Replies in red.
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    Your community support is remarkable and...

    Your community support is remarkable and appreciated, and I am definitely looking forward to the new Teensy(s).

    Are you far enough along yet to have an idea whether or not the T3.6 form factor...
  13. The only thing I can add, which may or may not be...

    The only thing I can add, which may or may not be helpful, is I wouldn't assume the meter can properly detect square wave frequency.

    I have a Fluke meter that I use at work, one night while...
  14. Yes, it should.

    Yes, it should.
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    I'm a moderator on another forum, you can view...

    I'm a moderator on another forum, you can view the IP address of each individual post, as well as each that a given user has logged in with and the one they registered the account with. I use IP...
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    I can't provide the level of detail you're...

    I can't provide the level of detail you're looking for, but I remember when I left the AVR boards that F() does nothing, at least on the Due and Teensy 3.6. I did some cursory searching and it seemed...
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    https://www.pjrc.com/teensy/td_pulse.html Does...

    https://www.pjrc.com/teensy/td_pulse.html

    Does this satisfy your needs?
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    You can do RPi in Bare Metal, but I found the...

    You can do RPi in Bare Metal, but I found the community support is a fraction of what's available with Arduino-derived systems, and the RPI platform didn't seem like a very good fit for a complex...
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    Forgot to mention, now can't edit my last post: ...

    Forgot to mention, now can't edit my last post:

    Blue waveform is the signal generator output (simulating the signal from the drive). Red waveform is voltage at the pin on the Arduino configured as...
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    In case this helps anyone else, here are my...

    In case this helps anyone else, here are my results with the LTV-816 opto using a 20k (.5mA) current-limiting resistor right off the simulated drive output:

    325Hz is the motor current with no...
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    Awesome, thanks for the input. Most of my...

    Awesome, thanks for the input. Most of my confusion was from a preconception the optoisolator was more of a switching element, but the CTR makes a lot more sense if ICE scales somewhat with LED...
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    Optoisolator Selection/Circuit Config

    Hey guys,

    I'm attempting to read a pulse signal from a Hitachi variable-frequency drive. The drive's reference guide states this output is a 0-10v square wave, with a limit of 2mA. This circuit...
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    Interesting. I will be well below whatever the...

    Interesting. I will be well below whatever the Due's memory limit is (don't recall and I'm not going to look it up right now. 512kb?).

    My curiosity has been piqued enough to benchmark the...
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    Okay, cool, just wanted to make sure there wasn't...

    Okay, cool, just wanted to make sure there wasn't some little syntax nuance messing up my declarations.
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    Those are all declared as unsigned. Are you...

    Those are all declared as unsigned. Are you saying "unsigned int" does not equate to uint32_t?
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    I don't understand. Everything millis() is used...

    I don't understand. Everything millis() is used with is an unsigned long. The only standard "int" in there is the pin declaration and there are no signed "long" variables at all.
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    Changing to explicits is the plan, though as I...

    Changing to explicits is the plan, though as I mentioned "int" and "long" are both 32-bit types on this microcontroller. Regardless, none of the ints in that example will be more than a 4-digit...
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    This specific project is using a Due, but that...

    This specific project is using a Due, but that looks like a good idea for the T3.6/T4 projects, which will need to read pulse signals as well.
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    A uint64_t would hold 18,446,744,073,709,551,615...

    A uint64_t would hold 18,446,744,073,709,551,615 micros, or 584,942.4 years. A 36-bit value would be plenty as I don't expect more than 12 hours of uptime at a go, but of course no such thing exists....
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    Datatype selection

    I've been reviewing datatype standards for a couple projects I'm working on, and have a couple points I could use guidance on. The current project is actually based on a Due but this is more for...
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    Interested to hear your thoughts on the Stone...

    Interested to hear your thoughts on the Stone screen and using it. Might just be the perfect solution for my similar project as well, but a bit more than I'm interested in spending without some...
  32. As protoshields are available for Mega/Due, I...

    As protoshields are available for Mega/Due, I would be interested in those.
  33. I did not, thank you. Incorporating that into the...

    I did not, thank you. Incorporating that into the final install may allow me to delete a port expander or two.
  34. Hopefully this isn't too dead... I'm liking...

    Hopefully this isn't too dead...

    I'm liking the T3.6 and want to use it for all the projects I have planned (at least until T4 blows it out of the water). The only trouble I'm having with it is...
  35. I don't know exactly what your project is, but it...

    I don't know exactly what your project is, but it sounds like a simple voltage divider is all you need:

    https://www.allaboutcircuits.com/tools/voltage-divider-calculator/

    If necessary, I build...
  36. You can overclock F_BUS by changing a config...

    You can overclock F_BUS by changing a config setting in (I think) one of the core libraries. I found that my project doesn't have the PWM freq/resolution requirements I thought it might, so I haven't...
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    Any updates? Really looking forward to...

    Any updates? Really looking forward to implementing v9 on several projects. Thanks.
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    This subject also came up in the Teensy 4 thread....

    This subject also came up in the Teensy 4 thread. As someone who's a rookie electronics hobbyist and fresh onto the Teensy bandwagon, something that I would have (still would, really) found very...
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    The NXP marketing blurb said FreeRTOS on it, I'm...

    The NXP marketing blurb said FreeRTOS on it, I'm guessing that means native support.
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    Interested in what you come up with, I have not...

    Interested in what you come up with, I have not made it to the display point in my project yet but it will require a RA8875. I was planning on modifying the library to isolate the RA8875 to its own...
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    Bring on the megahertz. More power, more better.

    Bring on the megahertz. More power, more better.
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    Understood. Thanks.

    Understood. Thanks.
  43. Sounds like he's got some time on that, though...

    Sounds like he's got some time on that, though personally I'm hoping for easier implementation of a real RTOS on the T4.
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    Are you at liberty to elaborate on this point a...

    Are you at liberty to elaborate on this point a little? Perhaps even just a comment on whether it's primarily less capabilities with the ADCs or PWM. Thanks.
  45. Bump for update, I am interested in this.

    Bump for update, I am interested in this.
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    I would also like to know how this is coming...

    I would also like to know how this is coming along.
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    Could you link an example of the serial string...

    Could you link an example of the serial string command for this?
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    The reset function works by shorting the reset...

    The reset function works by shorting the reset pin to ground, but nothing from the program pin. I even tried connecting it to physically different ground pins, again no luck.

    I did solder on the...
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    No dice. On USB power, same exact symptoms. I...

    No dice.

    On USB power, same exact symptoms. I jumped the ground and program contacts as suggested elsewhere, no dice. The onboard program button is working (continuity between ground and program...
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    If I'm picking up what you're laying down, that...

    If I'm picking up what you're laying down, that would be the case if I tried to set it to something like 16kHz instead of 14.6. Basically you would lose effective PWM resolution.

    What about going...
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